National Semiconductor LMV761, LMV762 Technical data

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LMV761/LMV762
Low Voltage, Precision Comparator with Push-Pull
Output

LMV761/LMV762 Low Voltage, Precision Comparator with Push-Pull Output

July 2002

General Description

The LMV761/762 are precision comparators intended for
applications requiring low noise and low input offset voltage.
The LV761 single has a shutdown pin that can be used to
disable the device and reduce the supply current. The
LMV761 is available in a space saving SOT23-6 or SOIC−8
package. The LMV762 dual is available in SOIC−8 or
MSOP-8 package.

They feature a CMOS input and Push-Pull output stage. The
Push-Pull output stage eliminates the need for an external
pull-up resistor.

The LMV761/762 are designed to meet the demands of
small size, low power and high performance required by
portable and battery operated electronics.

The input offset voltage has a typical value of 200µV at room
temp and a 1mV limit over temp.

Features

(VS=5V,TA= 25˚C, Typical values unless specified)

n Input offset voltage 0.2mV
n Input offset voltage (max over temp) 1mV
n Input bias current 0.2pA
n Propagation delay (OD = 50mV) 120 nsec
n Low supply current 300µA
n CMRR 100dB
n PSRR 110dB
n Extended Temperature Range −40˚C to 125˚C
n Push-pull output
n Ideal for 2.7V and 5V single supply applications
n Available in space-saving packages:

6-Pin SOT23 (single w/shutdown)
8-Pin SOIC (single w/shutdown)
8-Pin SOIC/MSOP (dual without shutdown)

Applications

n Portable and battery-powered systems
n Scanners
n Set top boxes
n High speed differential line receiver
n Window comparators
n Zero-crossing detectors
n High speed sampling circuits

Typical Circuit

20037032

Threshold Detector

© 2002 National Semiconductor Corporation DS200370 www.national.com

V

vs. V

OS

CC

20037010

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.

ESD Tolerance (Note 2)

LMV761/LMV762

Human Body Model 2000V

Machine Model 200V

+–V−

Supply Voltage (V

) 5.5V

Differential Input Voltage Supply Voltage

Voltage between any two pins Supply Voltage

Output Short Circuit to V

+-V−

Soldering Information

Wave Soldering (10 sec.) 260˚C (Lead Temp)

Junction Temperature 150˚C

Storage Temperature Range −65˚C to 150˚C

Operating Ratings

Supply Voltage (V+–V−) 2.7V to 5.0V

Temperature Range −40˚C to +125˚C

Package Thermal Resistance (Note 4)

SOT23-6 265˚C/W

SOIC-8 190˚C/W

MSOP-8 235˚C/W

Infrared or Convection (20 sec.) 235˚C

2.7V Electrical Characteristics

Unless otherwise specified, all limited guaranteed for TJ= 25˚C, VCM=V+/2, V+= 2.7V, V−=0V−. Boldface limits apply at the
temperature extremes. (Note 5)

Symbol Parameter Condition

V

OS

I

B

I

OS

CMRR Common Mode Rejection

Input Offset Voltage 0.2 1.0 mV

Input Bias Current (Note 8) 0.2 50 pA

Input Offset Current (Note 8) .001 5 pA

<

0V

<

V

VCC- 1.3V 80 100 dB

CM

Ratio

+

PSRR Power Supply Rejection Ratio V

CMVR Input Common Mode Voltage

= 2.7V to 5V 80 110 dB

>

CMRR

50dB −0.3

Range

V

O

I

SC

I

S

Output Swing High IL= 2mA, VID= 200mV V+– 0.35 V+– 0.1 V

Output Swing Low I

Output Short Circuit Current
(Note 3)

= −2mA, VID= −200mV 90 250 mV

L

Sourcing, VO= 1.35V, VID= 200mV 6.0 20

Sinking, V

= 1.35V, VID= −200mV 6.0 15

O

Supply Current

LMV762 (Both Comparators) 550 1400

I

OUT

LEAKAGE

I

S LEAKAGE

t

PD

t

SKEW

t

r

t

f

t

on

Output Leakage I@Shutdown SD = GND, VO= 2.7V 0.20 µA

Supply Leakage I@Shutdown SD = GND, VCC= 2.7V 0.20 2 µA

Propagation Delay

= 5.1kΩ

R

L

= 50pF

C

L

Overdrive = 5mV 270

Overdrive = 50mV 120

Propagation Delay Skew 5 ns

Output Rise Time 10% to 90% 1.7 ns

Output Fall Time 90% to 10% 1.8 ns

Turn On Time From Shutdown 6 µs

Min

(Note 7)

Typ

(Note 6)

Max

(Note 7) Units

1.5

V

mA

µALMV761 (Single Comparator) 275 700

nsOverdrive = 10mV 205

5.0V Electrical Characteristics

Unless otherwise specified, all limited guaranteed for TJ= 25˚C, VCM=V+/2, V+= 5.0V, V−=0V−. Boldface limits apply at the
temperature extremes.

Symbol Parameter Condition

V

OS

I

B

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Input Offset Voltage 0.2 1.0 mV

Input Bias Current (Note 8) 0.2 50 pA

Min

(Note 7)

Typ

(Note 6)

Max

(Note 7) Units

5.0V Electrical Characteristics (Continued)

Unless otherwise specified, all limited guaranteed for TJ= 25˚C, VCM=V+/2, V+= 5.0V, V−=0V−. Boldface limits apply at the
temperature extremes.

Min

Symbol Parameter Condition

I

OS

CMRR Common Mode Rejection

Input Offset Current (Note 8) 0.01 5 pA

<

0V

<

V

VCC- 1.3V 80 100 dB

CM

(Note 7)

Ratio

PSRR Power Supply Rejection Ratio V+= 2.7V to 5V 80 110 dB

CMVR Input Common Mode Voltage

CMRR

>

50dB −.3

Range

V

O

I

SC

I

S

Output Swing High IL= 4mA, VID= 200mV V+– 0.35 V+– 0.1 V

Output Swing Low I

Output Short Circuit Current
(Note 3)

= −4mA, VID= −200mV 120 250 mV

L

Sourcing, VO= 2.5V, VID= 200mV 6.0 60

Sinking, V

= 2.5V, VID= −200mV 6.0 40

O

Supply Current

LMV762 (Both Comparators) 450 1400

I

OUT

LEAKAGE

I

S LEAKAGE

t

PD

t

SKEW

t

r

t

f

t

on

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test condition, see the Electrical Characteristics.

Note 2: Unless otherwise specified human body model is 1.5kΩ in series with 100pF. Machine model 200pF.

Note 3: Electrical Table values apply only for factory testing conditions at the temperature indicated. Factory testing conditions result in very limited self-heating of

the device such that T
See Application section for information on temperature de-rating of this device. Absolute Maximum Rating indicate junction temperature limits beyond which the
device may be permanently degraded, either mechanically or electrically.

Note 4: The maximum power dissipation is a function of T
P

=(T

D

Note 5: Maximum temperature guarantee range is −40˚C to 125˚C.

Note 6: Typical values represent the most likely parametric norm.

Note 7: All limits are guaranteed by testing or statistical analysis.

Note 8: Guaranteed by design

Output Leakage I@Shutdown SD = GND, VO= 5.0V 0.20 µA

Supply Leakage I@Shutdown SD = GND, VCC= 5.0V 0.20 2 µA

Propagation Delay

= 5.1kΩ

R

L

= 50pF

C

L

Overdrive = 5mV 225

Overdrive = 50mV 120

Propagation Delay Skew 5 ns

Output Rise Time 10% to 90% 1.7 ns

Output Fall Time 90% to 10% 1.5 ns

Turn On Time from Shutdown 4 µs

. No guarantee of parametric performance is indicated in the electrical tables under conditions of internal self-heating where T

J=TA

), θJA, and TA. The maximum allowable power dissipation at any ambient temperature is

J(MAX)-TA)θJA

. All numbers apply for packages soldered directly into a PC board.

J(MAX

Typ

(Note 6)

Max

(Note 7) Units

3.8

mA

µALMV761 (Single Comparator) 225 700

nsOverdrive = 10mV 190

>

J

LMV761/LMV762

V

TA.

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Connection Diagrams

LMV761

Single 6-Pin SOT23

LMV761/LMV762

Top View

Ordering Information

Package Part Number Package Marking Transport Media NSC Drawing

6-Pin SOT23 LMV761MF C22A 1k units Tape and Reel MF06A

8-Pin SOIC LMV761MA LMV761MA Rail M08A

8-Pin SOIC LMV762MA LMV762MA Rail M08A

8-Pin MSOP LMV762MM C23A 1k Units Tape and Reel MUA08A

LMV761

20037001

Single 8-Pin SOIC

20037002

Top View

Dual 8-Pin SOIC & MSOP

LMV761MFX 3k units Tape and Reel

LMV761MAX 2.5k Units Tape and Reel

LMV762MAX 2.5k Units Tape and Reel

LMV762MMX 3.5k Units Tape and Reel

LMV762

20037003

Top View

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Typical Performance Characteristics

PSI vs. VCC(VO= High) PSI vs. VCC(VO= Low)

20037004 20037005

VOSvs. V

CC

LMV761/LMV762

Input Bias vs. Common Mode@25˚C

20037010

Input Bias vs. Common Mode@25˚C Output Voltage vs. Supply Voltage

20037025 20037011

20037024

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Typical Performance Characteristics (Continued)

Output Voltage vs. Supply Voltage Output Voltage vs. Supply Voltage

LMV761/LMV762

20037012 20037013

Output Voltage vs. Supply Voltage I

SOURCE

vs. V

OUT

20037014 20037006

I

vs. V

SINK

OUT

20037007

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I

SOURCE

vs. V

OUT

20037008

Typical Performance Characteristics (Continued)

I

vs. V

SINK

OUT

LMV761/LMV762

Prop Delay vs. Overdrive

20037009

20037019

Response Time vs. Input Overdrives Positive Transition Response Time vs. Input Overdrives Positive Transition

20037020 20037021

Response Time vs. Input Overdrives Negative Transition Response Time vs. Input Overdrives Negative Transition

20037022

20037023

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Application Hints

Basic Comparator

A basic comparator circuit is used to convert analog input
signals to digital output signals. The comparator compares
an input voltage (V
ence voltage (V

LMV761/LMV762

the output (VO) is low (VOL). However, if VINis greater

V

REF

than V

, the output voltage (VO) is high (VOH).

REF

) at the non-inverting input to the refer-

IN

) at the inverting pin. If VINis less than

REF

20037028

20037026

20037031

FIGURE 1. Basic Comparator

Hysteresis

The basic comparator configuration may oscillate or produce
a noisy output if the applied differential input is near the
comparator’s input offset voltage. This tends to occur when
the voltage on one input is equal or very close to the other
input voltage. Adding hysteresis can prevent this problem.
Hysteresis creates two switching thresholds (one for the
rising input voltage and the other for the falling input volt­age). Hysteresis is the voltage difference between the two
switching thresholds. When both inputs are nearly equal,
hysteresis causes one input to effectively move quickly past
the other. Thus, moving the input out of the region in which
oscillation may occur.

Hysteresis can easily be added to a comparator in a non­inverting configuration with two resistors and positive feed­back Figure 2. The output will switch from low to high when

rises up to V

V

IN

The output will switch from high to low when VINfalls to V
where V

IN2

The Hysteresis is the difference between V

= ((V

REF(R1+R2

, where V

IN1

=(V

V

IN1

is calculated by

=(V

V

IN2

REF(R1+R2

∆V

IN=VIN1-VIN2

))/R2)-((V

=V

is calculated by

IN1

REF(R1+R2

)–VCCR1)/R

REF(R1+R2

CCR1/R2

))/R

2

2

and V

IN1

))-(VCCR1))/R2)

IN2

IN2

.

20037027

FIGURE 2. Non-Inverting Comparator Configuration

Input

The LMV761/762 have near zero input bias current. This
allows very high resistance circuits to be used without any
concern for matching input resistances. This also allows the
use of very small capacitors in R-C type timing circuits. This
reduces the cost of the capacitors and amount of board
space used.

Shutdown Mode

The LMV761 features a low-power shutdown pin that is
activated by driving SD low. In shutdown mode, the output is
in a high impedance state, supply current is reduced to 20nA
and the comparator is disabled. Driving SD high will turn the
comparator on. The SD pin should not be left unconnected
due to the fact that it is a high impedance input. When left
unconnected, the output will be at an unknown voltage. Also
do not three-state the SD pin.

The maximum input voltage for SD is 5.5V, referred to
ground and is not limited by VCC. This allows the use of 5V
logic to drive SD while V

,

as 3V. The logic threshold limits for SD are proportional to

operates at a lower voltage, such

CC

VCC.

Board Layout and Bypassing

The LMV761/762 is designed to be stable and oscillation
free, but it is still important to include the proper bypass
capacitors and ground pickups. Ceramic 0.1µF capacitors
should be placed at both supplies to provide clean switching.
Minimize the length of signal traces to reduce stray capaci­tance.

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Physical Dimensions inches (millimeters)

unless otherwise noted

LMV761/LMV762

6-Pin SOT23

NS Package Number MF06A

8-Pin SOIC

NS Package Number M08A

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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

8-Pin MSOP

NS Package Number MUA08A

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NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL

LMV761/LMV762 Low Voltage, Precision Comparator with Push-Pull Output

COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:

1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the

2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.

labeling, can be reasonably expected to result in a
significant injury to the user.

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